Air conditioning works on high level

I had heating problems in winter, I replaced blower motor resistor and heat worked fine all winter long. Now is summer and the air conditioning works when starting the car and for a few miles then stops, if turned up all the way to highest speed continues to work but I'm afraid eventually will stop completely. If I turn off the air and later restart the process repeats. Do you have any suggestions? Thank you

1 Answer

Replace power module. Its under the hood. In the air duct up against the firewalll. About 12" to the left of the blower motor. Has 2 connectors on top. Its black. May be hard to notice. Probably have to remove cross brace to get at.it. Then remove 3 screws and pull it out. Put in new one. Reattach brace

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If the blower motor works on high, the resistor is the fault. Check condition of wire harness when you replace the resistor, if there is any corrosion on the connectors in the harness- replace that section of harness as well, otherwise you will likely have another failed resistor and potentially have a fire hazard as the corroded terminals heat up and current draw through the wire increases as well.

this problem is caused by the blower motor speed control resistor, it is located near the blower motor, the resistor end goes into the air duct for cooling, replace this p[art and the problem will be solved. See pitcure below, the part is about $13

most of the time the resistor is located downwind of the blower motor so it should be not to fao from the blower motor in the right rear of the van behind the quater trim panel which is the hvac unit is located

Your blower speed resistor has gone bad and needs to be replaced. You can pick one up at Auto Zone or Parts Source with the step by step instructions to getting the resistor replaced with common tools.

It is located under the glove box, way in the back of the passenger
foot area. You'll need to remove 2 screws with a 7mm socket, and remove
the plastic cover that covers the blower motor and another component
box that I think controls the passenger airbag. After removing the
plastic cover you'll need to side that passenger airbag module to the
right so it pop off its mounting bracket and move it out of the way.
That will give a better view of the blower motor. I highly recommend you
also remove the blower motor itself because the Blower Motor Resistor
is located behind it. I think you'll need a 5mm or 5.5mm socket to
remove the 3 screws that hold in place the blower motor and 2 more
screws for the Blower Motor Resistor... It's a cramped location to work
in but if you have all the tools and enough lighting then it shouldn't
take more than 30-60 minutes to do. The Blower Motor Resistor costs
about $19-$25. Good luck

The Blower Motor Resistor is a common problem in your car but not for the problem you describe. When the Heat/AC won't blow on all speeds, the blower motor resistor is at fault. When air won't blow out of vents, bi-level, or floor the problem is the blend door actuator. This is vacuum driven and diverts the air to where you select. When air will only blow from one place (usually the defrost) then the blend door actuator is the problem. This can sometimes be corrected if there's a vacuum leak (usually under the hood in front of the passenger you'll find the vacuum line and can trace it backward to find a leak). If no leak can be found, the blend door actuator itself is defective and needs replacement.

The blower motor works on high setting ONLY when the blower resistor is
bad. The blower motor resistor is held in place with 2 screws and
attached into the heater housing under the right side of the dashboard.
You can identify the resistor by the big wires that are connected to
the connector. If this heating/cooling system is the auto temp type,
the part is a bit high on the price.